diff --git a/tests/unit/conftest.py b/tests/unit/conftest.py
index 253ae7a6119..3bdab1d231a 100644
--- a/tests/unit/conftest.py
+++ b/tests/unit/conftest.py
@@ -1,16 +1,23 @@
 from collections.abc import Iterator
+from typing import Final
 
 import pytest
 from pytest_socket import enable_socket, socket_allow_hosts
 
+LOOPBACK_HOSTS: Final = ["127.0.0.1", "::1"]
+
+
+def _allow_loopback_only() -> None:
+    socket_allow_hosts(LOOPBACK_HOSTS, allow_unix_socket=True)
+
 
 @pytest.fixture(autouse=True, scope="session")
 def block_external_sockets() -> Iterator[None]:
-    socket_allow_hosts(["127.0.0.1", "::1"], allow_unix_socket=True)
+    _allow_loopback_only()
     yield
     enable_socket()
 
 
 @pytest.hookimpl(trylast=True)
 def pytest_runtest_setup() -> None:
-    socket_allow_hosts(["127.0.0.1", "::1"], allow_unix_socket=True)
+    _allow_loopback_only()